The food displayed on counters look
attractive and tempting, thanks to food dyes, mostly synthetic. Widely used in
packaged foods for visual appeal, it could posed health issues for children who
are vulnerable. Clinical trials, animal studies, and regulatory reviews have
linked certain artificial dyes to behavioural changes, allergic reactions, and
emerging effects involving the gut–brain axis. Natural colourants such as
beetroot, turmeric, and paprika extracts offer lower-toxicity alternatives for
families seeking dye-free food options.
Artificial
colour additives are commonly incorporated into processed foods and beverages for
bright, stable, and uniform colouration. The most frequently used certified
dyes include Red (Allura Red), Yellow (Tartrazine and Sunset Yellow), and Blue,
Brilliant Blue for colouring . products such as candies, cereals, sports
drinks, snack foods, sauces, and frozen desserts. Despite approval by regulatory agencies, their
permitted uses and labelling requirements vary from place to place.
Behavioural outcomes, particularly those
related to attention and hyperactivity, have been a major focus of
investigation. A systematic health hazard assessment showed that more than half
of the 27 paediatric clinical trials reported adverse reactions owing to
exposure to sysynthetic dyes. Supporting animal studies reinforce biological
plausibility, with proposed mechanisms involving alterations in dopamine
signaling, immune activation, and histamine release.
Children consume more dye-containing foods
than adults. Developmental immaturity of hepatic detoxification systems and
intestinal transport mechanisms may further limit efficient metabolism and
elimination of these compounds. Individual variability in cytochrome P450
enzyme activity, phase II conjugation pathways, and histamine metabolism may
influence sensitivity to synthetic dyes. Children with autism spectrum disorder
may face additional risk due to restrictive eating patterns and micronutrient
deficiencies that impair antioxidant defences.
Synthetic dyes have also been associated
with allergic and pseudoallergic reactions. Azo dyes such as tartrazine may be
metabolised into aromatic amines that act as sensitisers, with reported
symptoms including urticaria, itching, and asthma-like reactions, particularly
in children.
Emerging research suggests that
interactions between synthetic dyes and the gut microbiota could be harmful.
Certain dyes can be metabolised by intestinal bacteria into compounds that may
disrupt microbial balance, promote inflammation, and influence gut–brain
communication.
Regulatory approaches differ across nations
and the issue needs to be addressed.
